diff options
Diffstat (limited to 'drivers/sensorhub/stm/ssp_spi.c')
| -rwxr-xr-x | drivers/sensorhub/stm/ssp_spi.c | 255 |
1 files changed, 255 insertions, 0 deletions
diff --git a/drivers/sensorhub/stm/ssp_spi.c b/drivers/sensorhub/stm/ssp_spi.c new file mode 100755 index 00000000000..469a95bfa73 --- /dev/null +++ b/drivers/sensorhub/stm/ssp_spi.c @@ -0,0 +1,255 @@ +/* + * driver for Android SensorHub SPI + * + * Copyright (c) 2013, Samsung Electronics. All rights reserved + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY + * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * for more details. + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/spi/spi.h> +#include <linux/delay.h> + +#if defined(DEBUG_SSP_SPI) +#define ssp_log(fmt, arg...) \ + do { \ + printk(KERN_ERR "[%s:%d] " fmt , \ + __func__, __LINE__, ##arg); \ + } \ + while (0) +#else +#define ssp_log(fmt, arg...) +#endif + + +/* If AP can't change the endian to BIG */ +/* for s5c73m ISP, this option must is required.*/ +/* This option depends on SPI_DMA_MODE */ +/* in camera driver file*/ +/*#define CHANGE_ENDIAN */ + + +int ssp_spi_write_sync(struct spi_device *spi, const u8 *addr, const int len) +{ + int ret; +#if defined(CHANGE_ENDIAN) + u8 buf[8] = {0}; +#endif + + struct spi_message msg; + + struct spi_transfer xfer = { + .len = len, +#if !defined(CHANGE_ENDIAN) + .tx_buf = addr, + /*QCTK ALRAN QUP_CONFIG 0-4 bits BIG ENDIAN*/ + .bits_per_word = 8, +#else + .tx_buf = buf, +#endif + }; + +#if defined(CHANGE_ENDIAN) + buf[0] = addr[3]; + buf[1] = addr[2]; + buf[2] = addr[1]; + buf[3] = addr[0]; + buf[4] = addr[7]; + buf[5] = addr[6]; + buf[6] = addr[5]; + buf[7] = addr[4]; +#endif + + spi_message_init(&msg); + spi_message_add_tail(&xfer, &msg); + + ret = spi_sync(spi, &msg); + + if (ret < 0) + ssp_log("error %d\n", ret); + + return ret; +} + + +int ssp_spi_read_sync(struct spi_device *spi, u8 *in_buf, size_t len) +{ + int ret; + u8 read_out_buf[2]; + + struct spi_message msg; + struct spi_transfer xfer = { + .tx_buf = read_out_buf, + .rx_buf = in_buf, + .len = len, + .cs_change = 0, + }; + + spi_message_init(&msg); + + spi_message_add_tail(&xfer, &msg); + + ret = spi_sync(spi, &msg); + + if (ret < 0) + ssp_log("%s - error %d\n", + __func__, ret); + + return ret; +} + + +int ssp_spi_sync(struct spi_device *spi, u8 *out_buf, + size_t out_len, u8 *in_buf) +{ + int ret; + + struct spi_message msg; + struct spi_transfer xfer = { + .tx_buf = out_buf, + .rx_buf = in_buf, + .len = out_len, + .cs_change = 0, + }; + + spi_message_init(&msg); + + spi_message_add_tail(&xfer, &msg); + + ret = spi_sync(spi, &msg); + ssp_log("%s - received %d\n", __func__, xfer.len); + + if (ret < 0) + ssp_log("%s - error %d\n", + __func__, ret); + + return ret; +} + +unsigned int g_flag_spirecv; +void ssp_spi_async_complete(void *context) +{ + g_flag_spirecv = 1; +} + +int ssp_spi_async(struct spi_device *spi, u8 *out_buf, + size_t out_len, u8 *in_buf) +{ + int ret; + + struct spi_message msg; + struct spi_transfer xfer = { + .tx_buf = out_buf, + .rx_buf = in_buf, + .len = out_len, + .cs_change = 0, + }; + + + spi_message_init(&msg); + + spi_message_add_tail(&xfer, &msg); + msg.complete = ssp_spi_async_complete; + + ret = spi_async(spi, &msg); + + if (ret < 0) + ssp_log("%s - error %d\n", + __func__, ret); + + return ret; +} + + + + +int ssp_spi_read(struct spi_device *spi, u8 *buf, size_t len, const int rxSize) +{ + int k; + int ret = 0; + u8 temp_buf[4] = {0}; + u32 count = len/rxSize; + u32 extra = len%rxSize; + + for (k = 0; k < count; k++) { + ret = ssp_spi_read_sync(spi, &buf[rxSize*k], rxSize); + if (ret < 0) { + ssp_log("%s - error %d\n", + __func__, ret); + return -EINVAL; + } + } + + if (extra != 0) { + ret = ssp_spi_read_sync(spi, &buf[rxSize*k], extra); + if (ret < 0) { + ssp_log("%s - error %d\n", + __func__, ret); + return -EINVAL; + } + } + + for (k = 0; k < len-3; k += 4) { + memcpy(temp_buf, (char *)&buf[k], sizeof(temp_buf)); + buf[k] = temp_buf[3]; + buf[k+1] = temp_buf[2]; + buf[k+2] = temp_buf[1]; + buf[k+3] = temp_buf[0]; + } + + return 0; +} + +int ssp_spi_write(struct spi_device *spi, const u8 *addr, + const int len, const int txSize) +{ + int i, j = 0; + int ret = 0; + u8 paddingData[8]; + u32 count = len/txSize; + u32 extra = len%txSize; + ssp_log("Entered\n"); + ssp_log("count = %d extra = %d\n", count, extra); + + memset(paddingData, 0, sizeof(paddingData)); + + for (i = 0 ; i < count ; i++) { + ret = ssp_spi_write_sync(spi, &addr[j], txSize); + j += txSize; + if (ret < 0) { + ssp_log("failed to write ssp_spi_write_sync\n"); + goto exit_err; + } + ssp_log("Delay!!!\n"); + msleep(50); + } + + if (extra) { + ret = ssp_spi_write_sync(spi, &addr[j], extra); + if (ret < 0) { + ssp_log("failed to write ssp_spi_write_sync\n"); + goto exit_err; + } + } + + for (i = 0; i < 4; i++) { + memset(paddingData, 0, sizeof(paddingData)); + ret = ssp_spi_write_sync(spi, paddingData, 8); + if (ret < 0) { + ssp_log("failed to write ssp_spi_write_sync\n"); + goto exit_err; + } + } + ssp_log("Finish!!\n"); +exit_err: + return ret; +} + |